chemIf .275 moles of ferrous ammonium sulfate and an excess of all other reagents are used in a synthesis of K3[Fe(C2O4)3]*3H2O, how many grams of product will be obtained if the reaction gives a 53% yield? Can you plz explain to me in steps
January 31, 2009

AP ChemIn a typical synthesis reaction, 0.142 g of chlorine gas is reacted with an unkown elemnt X to form a compound with the formula XCl3. If the final product has a mass of 0.178 g, what is the atomic mass of the unknown element?
January 12, 2009

sciencei do not understand how to answer the question if it has (N) instead if saying (kg) how would i answer, and the question is.: if the net force is 100N, and the acceleration is 5m/s squared how much mass am i moving? please answer soon!! Thank You!!
January 6, 2009

biologyfor which question? i think there's more than one answer for each, though i'm not sure.
January 4, 2009

biologyWhich have cells walls? (more than one may be correct) A)chilomonas B)volvox C)peranema. Which have chloroplasts? (more than one may be correct) A)Paramecium B)Amoeba C)chilomonas D)volvox E)peranema
January 4, 2009

BiologyWhat are two types of materials or observations that would necessitate the use of the stereoscopic microscope? What organelles are visible with the electron microscope but not with the light microscope? (we've been studying single celled organisms and organelles).
January 4, 2009

BiologyWhich of these organisms have cell walls? Which have chloroplasts? Describe their organization. Paramecium Amoeba Chilomonas Volvox Paranema I've tried searching on the web, but the pages don't mention chloroplasts or cell walls. Which means they either don't have ...
January 2, 2009

BiologyWhat are two types of materials or observations that would necessitate the use of the stereoscopic microscope? What organelles are visible with the electron microscope but not with the light microscope? (we've been studying single celled organisms and organelles).
January 2, 2009

BiologyWhich of these organisms have cell walls? Which have chloroplasts? Describe their organization. Paramecium Amoeba Chilomonas Volvox Paranema
January 1, 2009

englishWhen using plural possessives, do you make the noun afterwards plural? For example: Many families own pets which live in their homes. or Many families own pets which live in their home.
December 17, 2008

algebrahi. I'm expected to solve (27ab^3)^1/3 times the sq. root of (there is a three in the nook of the square root) 5a^4b. I follow it until it reduces to the square root of (still with the three in the nook), 3^3a^3b^3 times 5 a^2 b. Where does the three on the first a ...
December 14, 2008

MathSuppose that the function represents the percentage of inbound e-mail in the U.S. that is considered spam, where x is the number of years after 2002. Use this model to approximate the percentage of spam in the year 2006 to the nearest tenth of a percent. Please show work.. ...
December 10, 2008

Sentence EditingFor example, a female may make her eyes appear rounder by completely outlining her eye to both corners, more oval by lining the top lid thicker in the middle, or larger by finely lining the bases of both the upper and lower lashes. I want to put "than before" in ...
December 7, 2008

Business mangement and leadershipRead through the 12 principals for Manging Change .Then select three principals you feel are most important to follow when managing and describe why you feel these are essential. Describe some specific techniques that can be used to manage change in an organiziation. explain ...
November 29, 2008

Essay WritingSo everything else doesn't have to be parallel like needs and personalities and cats and dogs aren't gerunds but thats ok since they are a different part of the outline?
November 24, 2008

Essay WritingI need help with parallel structure. My essay is contrasting cats and dogs, with cats being the superior (sorry dog lovers). One paragraph is to be block method the other is to be point by point. II. Body A. Needs 1. Feeding a. Cats b. Dogs 2. Training a. Cats b. Dogs 3. ...
November 24, 2008

maththe formula is that you add 5+9= 14 divide 120/14 and I keep getting a decimal, and then you would multiply that number by 5 and 9, and when those 2 numbers add up it would equal 120.. I just cant seem to figure this out though
November 24, 2008

math Mix B= 5 cups of fruitjuice ; 9 cups of soda For this mix how much fruit juice and how much soda are needed to make punch for 240 people( each person gets half a cup of punch)
November 24, 2008

AP Chem87. At what temperature would CO2 molecules have an rms speed equal to H2 molecules 25 degrees C? First I got the rms of H2 to be 1927.3 by taking u= sq root (3*8.31*298)/(.002 Then I tried to find the temp of CO2 by using 1927.3 sq root .044/ sq root (3*8.31) and I got 81.0 K...
November 20, 2008

chemistryI'm not sure, but I think if you had lemonade with pulp it would be a heterogenous mixture because the mixture would not all look the same; you would have the liquid and the pieces of pulp.
November 19, 2008

Molecular SpeedsCan someone just work me through how to do this one problem? I should be OK on the rest then. Calculate the rms speeds of N2 molecules at 23 degrees C and at 125 degrees C. Sketch the approximate curves of the molecular speed distributions of N2 at 25 degrees C and 125 degrees...
November 19, 2008

AP ChemWhen dealing with gasses, do you subtract the pressure of water vapor every time it is in the equation? I'm confused on when you subtract it. Such as this problem... NH4NO2(s) -> 2H2O(g) + N2(g) How many grams of ammonium nitrate must have reacted if 3.75 dm^3 of ...
November 19, 2008

AP ChemWould someone please check these for me? 52. In an experiment, you fill a heavy-walled 5.00-L flask with methane gas, CH4. If the flask contains 7.13 g of methane at 19 degrees C, what is the gas pressure? 2.14 atm 56. A 2.50-L flask was used to collect a 5.65-g sample of ...
November 19, 2008

SpanishCan you please help me translate these sentences using preterite vs. imperfect? 1. It was three o'clock when she got up to start the day. 2. While Philip fried the potatoes in oil, Elena vaccumed the living room. 3. Before leaving, I turned off the lights and closed the ...
November 17, 2008

Chem81. Formic acid HCHO2, is a convenient source of small quantities of carbon monoxide. When warmed with sulfuric acid, formic acid decomposes to give CO gas. HCHO2(l) -> H2O(l) + CO(g) If 3.85 L of carbon monoxide was collected over water at 25 degrees C and 689 mmHg, how ...
November 16, 2008

AP ChemPhosphorus pentachloride is a white solid that sublimes (vaporizes without melting) at about 100 degrees C. At higher temperatures, the PCl5 vapor decomposes to give phosphorus trichloride and chlorine. How could gas-density measurements help to establish that PCl5 vapor is ...
November 16, 2008

AP ChemAmmonium Chloride is a white solid. When heated to 325 degrees C, it gives a vapor that is a mixture of ammonia and hydrogen chloride. Suppose someone contends that the vapor consists of NH4Cl molecules rather than a mixture of NH3 and HCl. Could you decide between these ...
November 16, 2008

AP ChemPhosphorus pentachloride is a white solid that sublimes (vaporizes without melting) at about 100 degrees C. At higher temperatures, the PCl5 vapor decomposes to give phosphorus trichloride and chlorine. How could gas-density measurements help to establish that PCl5 vapor is ...
November 15, 2008

AP ChemAmmonium Chloride is a white solid. When heated to 325 degrees C, it gives a vapor that is a mixture of ammonia and hydrogen chloride. Suppose someone contends that the vapor consists of NH4Cl molecules rather than a mixture of NH3 and HCl. Could you decide between these ...
November 15, 2008

AP ChemHelp with these two please. 105. A radioactive metal atom decays (goes to another kind of atom) by emitting an alpha particle (He+2 ion). The alpha particles are collected as helium gas. A sample of helium with a volume of 12.05 mL was obtained at 765 mmHg and 23 Degrees C. ...
November 12, 2008

AP ChemCan someone please check these problems? 34. You fill a balloon with helium gas to a volume of 2.68 L at 23 degrees C and 789 mmHg. Now you release the balloon. What would be the volume of helium if its pressure changes to 632 mmHg but the temperature is unchanged? 3.35 L 38. ...
November 12, 2008

MathI think it would be 28/100. Because if 72/100 is used for work then the rest of that would be 100-72 which is 28. And percents are over 100.
November 12, 2008

ChemCan someone check these homework answers please? 32. The barometric pressure measured outside an airplane at 9 km was 259 mmHg. Calculate the pressure in kPa. 34.5 kPa 36. A diving bell is a container open at the bottom. As the bell descends, the water level inside changes so ...
November 11, 2008

Investments/Portfolio MgtHow would the following be solved... Consider a risky portfolio. The end-of-year cash flow derived from the portfolio will be either $50,000 or $150,000, with equal probabilities of 0.5. The alternative riskless investment in T-bills pays 5%. a. If you require a risk premium ...
November 10, 2008

chemWhat is the relationship between kPa and atm when dealing with measurements of pressure of a gas?
November 9, 2008

chemA vessel containing 39.5 cm^3 of helium gas at 25 degrees celsius and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If tihs required 7.7 cm^3 of ethanol, what was the final ...
November 9, 2008

AP ChemI did that and got -22.7. 1st of all the answer is supposed to be .65 L 2nd of all where does the negative go?
November 9, 2008

AP ChemHelium gas, He, at 22 degrees C and 1.00 atm occupied a vessel whose volume was 2.54 L. What volume would this gas occupy if it were cooled to liquid-nitrogen temperature (-197 degrees celcius). What is the equation?
November 9, 2008

otheri have four legs but can stand on one, i come out in the daylight but not in the sun. i have two sisters who our in power, my grandmother looks like a natural flower. some say im old but i feel like new, i stick to the bottom of your shoe! what am i?
November 5, 2008

EssayI wrote an essay of examples on how cosmetics produce a flawless face. The title I came up with is Fixing Feminine Features. I don't know if I like it of not, but I wanted to do something that caught attention. Any tips?
November 4, 2008

AP ChemA sample of H2 is collected by displacing 145 mL of water. The pressures of the gas and the atmosphere are equalized. The atmospheric pressure is 745 mmHg. The temperature of the water and gas are identical at 26 degrees C. How many moles of H2 have been evolved?
November 4, 2008

AP ChemA solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. It requires 51.7 mL of 0.145 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2 in the solution? If you want the whole equation...
November 3, 2008

AP ChemThanks for walkin me through that one =]. It helped a lot with the other problems like that too.
November 3, 2008

AP ChemA chemist added an excess of sodium sulfate to a solution of a soluble barium compound to precipitate all of the barium ion as barium sulfate, BaSO4. How many grams of barium ion are in a 458-mg sample of the barium compound if a solution of the sample gave 513 mg BaSO4 ...
November 3, 2008

AP ChemAn aqueous solution contains 4.50 g of calcium chloride, CaCl2, per liter. What is the molarity of CaCl2? When calcium chloride dissolves in water, the calcium ions, Ca^+2, and chloride ions, Cl^-, in the crystal go into the solution. What is the molar concentration of each ...
November 3, 2008

AP ChemA 3.50 g sample of KCl is dissolved in 10.0 mL of water. The resulting solution is then added to 60.0 mL of a 0.500 M CaCl2(aq) solution. Assuming that the volumes are additive, calculate the concentrations of each ion present in the final solution. *confused*
November 3, 2008

AP ChemYes, thank you. I was trying to do the equation like it was a carbonate that produced carbon dioxide, not as an acid.
November 3, 2008

AP ChemComplete and balance each of the following molecular equations, including phase labels, if a reaction occurs. Then write the net ionic equation. If no reaction occurs, write NR after the arrow. H2CO3(aq)+Sr(OH)2(aq) -> this is what I put but I think its wrong H2CO3(aq)+Sr(...
November 3, 2008

Essayoh yeah i know they arent sentences. they are just ideas for the sentences. but they have to be in inverted order and i need a topic broader than giving back to the community.
October 19, 2008

Essayi'm writing an inverted intro paragraph and these are the sentences i have so far. 1. ? 2. giving back to the community 3. community service 4. the youth volunteering 5. benefits of youth volunteering for commuity service can anyone think of a beginning sentence or make ...
October 19, 2008

phsical educationi need a lot of help lets just say that my gym teacher is making my class take health so i have a huge asignment due on monday i need 101 ways to be healthy they can be physical, emotional, mental,social, intellectual, and spiritual Good Luck (i know i tryed) -ANNA-
October 15, 2008